Convictions

Estrada was convicted of sexual assault on a child on October 27, 1977. [2] He served six years in prison after he was convicted of committing lewd acts with a child in Orange County, California in December 1994. In January 2012, he pleaded guilty to a charge of continuous sexual abuse of a child which happened in March 2008. In the plea bargain agreement, he was sentenced to 25 years in prison and is not eligible for parole.[3]

"Freak Out" liner notes

From the "biographical trivia" section on the Freak Out! (1966) album:

... Moved into my recording studio, joined forces with Ray, Jim and Roy, schemed and plotted for a year, working in beer joints, blah, blah, starved a lot, etc... played a lot of freaky music & stayed vastly unpopular (though notorious). OWE OUR EXISTENCE to Mark Cheka for his initial encouragement and sterling example (and to a whole bunch of other people who are going to be bugged because their names aren't listed in detail, with addresses and pertinent facts about what they like about the government & their other fetishes). Ray used to be a carpenter and a bartender and sing with Little Julian Herrera & The Tigers (note the falsetto part in 'I REMEMBER LINDA')... been singing R&B for ten to twelve years. Jim got fired from some idiot band in Kansas, forcing him to move to California. Lucky for us. Seems he just couldn't get turned on playing " Louie, Louie" all night... it must have hurt him deeply when they rejected him. Roy is an asthmatic Pachuco, good-natured excellent bass player, involved in the R&B scene here for about ten years. He is unbelievably tolerant. I don't understand it. Elliot digs the blues. He has a big dimple in his chin. We made him grow beard to cover it up. He just got out of the Army. Lucky for the Army. THEY ARE ALL MUSICIANS.

Conceptual Continuity

Zappa referred to Estrada near the end of Legend Of The Illinois Enema Bandit: "Wait a minute. This is for Roy Estrada, wherever he is. Wanna, wanna enema, e-nemààààà, wanna, wanna enema, e-nemàààà".